Test 1 Power Supply Pwb Low Voltage Test - LG 42LG70 Training Manual

TEST 1 Power Supply PWB Low Voltage Test

TEST 1 Power Supply PWB Low Voltage Test
AC Should not be applied at any time while adding resistors or
while unplugging connectors as damage to the circuit PWB
may occur.
a) The SMPS PWB "MUST" be producing STBY 5V on either pin
9, 10, 11 or 12 (5V).
b) The SMPS PWB "MUST" be generating ACD (AC Detect).
If the conditions (a) or (b) above are not met, the SMPS PWB is
defective and must be replaced. There is no need to continue
with the test.
(c) Unplug P201 or P800 and P204 to the ballast.
TEST 1:
(2) Add a 10K resistor between (5V STBY) pin 9, 10, 11 or 12 and
Pin 19 (PWR). Apply AC. This will turn on the power supply.
a) Check that the 16V and 12V power supplies are
turned on, P201 (16V pins 1 and 2) (12V pins 5 and 6)
b) Check that the 24V on P204 pins 1~5 (Ballast Voltage)
is turned on.
(3) Remove AC power. Reinsert the plug P204 to the ballast.
Spring 2009
30
LCD DV 42LG70